linux-kernel - [PATCH 3/4] amba: request muxing for PrimeCell devices

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Message-ID: <1304363809-30444-1-git-send-email-linus.walleij@stericsson.com>
Date:	Mon, 2 May 2011 21:16:49 +0200
From:	Linus Walleij <linus.walleij@...ricsson.com>
To:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Lee Jones <lee.jones@...aro.org>,
	Martin Persson <martin.persson@...ricsson.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 3/4] amba: request muxing for PrimeCell devices

From: Linus Walleij <linus.walleij@...aro.org>

This makes the AMBA PrimeCell drivers request padmuxing for
themselves in the same manner as clocks and voltage is currently
requested.

Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 drivers/amba/bus.c       |   49 ++++++++++++++++++++++++++++++++++++++++++++-
 include/linux/amba/bus.h |    2 +
 2 files changed, 49 insertions(+), 2 deletions(-)

diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index 7025593..0cedda6 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -474,6 +474,40 @@ static void amba_put_disable_vcore(struct amba_device *pcdev)
 	}
 }
 
+static int amba_get_enable_pinmux(struct amba_device *pcdev)
+{
+	struct pinmux *pmx = pinmux_get(&pcdev->dev, NULL);
+	int ret;
+
+	pcdev->pmx = pmx;
+
+	if (IS_ERR(pmx)) {
+		/* It is OK not to supply a pinmux regulator */
+		if (PTR_ERR(pmx) == -ENODEV)
+			return 0;
+		return PTR_ERR(pmx);
+	}
+
+	ret = pinmux_enable(pmx);
+	if (ret) {
+		pinmux_put(pmx);
+		pcdev->pmx = ERR_PTR(-ENODEV);
+	}
+
+	return ret;
+}
+
+static void amba_put_disable_pinmux(struct amba_device *pcdev)
+{
+	struct pinmux *pmx = pcdev->pmx;
+
+	if (!IS_ERR(pmx)) {
+		pinmux_disable(pmx);
+		pinmux_put(pmx);
+	}
+}
+
+
 /*
  * These are the device model conversion veneers; they convert the
  * device model structures to our more specific structures.
@@ -486,13 +520,22 @@ static int amba_probe(struct device *dev)
 	int ret;
 
 	do {
-		ret = amba_get_enable_vcore(pcdev);
+		ret = amba_get_enable_pinmux(pcdev);
 		if (ret)
 			break;
 
+		ret = amba_get_enable_vcore(pcdev);
+		if (ret) {
+			amba_put_disable_pinmux(pcdev);
+			break;
+		}
+
 		ret = amba_get_enable_pclk(pcdev);
-		if (ret)
+		if (ret) {
+			amba_put_disable_pinmux(pcdev);
+			amba_put_disable_vcore(pcdev);
 			break;
+		}
 
 		ret = pcdrv->probe(pcdev, id);
 		if (ret == 0)
@@ -500,6 +543,7 @@ static int amba_probe(struct device *dev)
 
 		amba_put_disable_pclk(pcdev);
 		amba_put_disable_vcore(pcdev);
+		amba_put_disable_pinmux(pcdev);
 	} while (0);
 
 	return ret;
@@ -513,6 +557,7 @@ static int amba_remove(struct device *dev)
 
 	amba_put_disable_pclk(pcdev);
 	amba_put_disable_vcore(pcdev);
+	amba_put_disable_pinmux(pcdev);
 
 	return ret;
 }
diff --git a/include/linux/amba/bus.h b/include/linux/amba/bus.h
index fcbbe71..7b5a2a5 100644
--- a/include/linux/amba/bus.h
+++ b/include/linux/amba/bus.h
@@ -19,6 +19,7 @@
 #include <linux/err.h>
 #include <linux/resource.h>
 #include <linux/regulator/consumer.h>
+#include <linux/pinmux.h>
 
 #define AMBA_NR_IRQS	2
 #define AMBA_CID	0xb105f00d
@@ -30,6 +31,7 @@ struct amba_device {
 	struct resource		res;
 	struct clk		*pclk;
 	struct regulator	*vcore;
+	struct pinmux		*pmx;
 	u64			dma_mask;
 	unsigned int		periphid;
 	unsigned int		irq[AMBA_NR_IRQS];
-- 
1.7.3.2

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